国际奥委会对俄罗斯冬奥会充满信心
The International Olympic Committee president says he has confidence that Russian authorities will deliver a "safe and secure" Games in Sochi.
国际奥委会主席称，他相信俄罗斯当局会在索契向世人展示一场“安全放心”的冬奥会。
Thomas Bach wrote to President Vladimir Putin to express condolences（慰问，哀悼） for the "despicable" attacks that struck Volgograd within 24 hours.
Investigators say the attacks on a railway station and trolleybus, which killed at least 31 people, were linked.
They struck just over a month before the Winter Olympics begin.
Volgograd was also targeted in October, when a suspected female suicide bomber killed six people in an attack on a bus.
It is being widely assumed in Russia that the people who carried out the Volgograd bombings were involved in the Islamist-inspired insurgency against Russian rule in the Caucasus republics of Chechnya and Dagestan, and that the target was the Games, says the BBC's Moscow correspondent Daniel Sandford.
In a statement, Russia's foreign ministry did not blame any particular group but likened the attacks to acts by militants in the United States, Syria and elsewhere.
It called for international solidarity in the fight against "an insidious enemy that can only be defeated together", reported Reuters news agency.
Regional Governor Sergei Bozhenov said the bombings were a "serious test" for all Volgograd residents and all Russians.